function nTabs(thisObj, Num) {
		if (thisObj.className == "active") return;
		var tabList = document.getElementById("myTab").getElementsByTagName("li");
		for (i = 0; i < tabList.length; i++) {//点击之后，其他tab变成灰色，内容隐藏，只有点击的tab和内容有属性
			if (i == Num) {
				thisObj.className = "active";
				document.getElementById("myTab_Content" + i).style.display = "block";
				} else {
					tabList[i].className = "normal";
					document.getElementById("myTab_Content" + i).style.display = "none";
						}
				}
	}
  